Steam-boiler



(No Model.) H.S. PELL. STEAM BOILER- No. 549,012. Patented Oct. 29,1895.

1 H I m I H H in the upper part of the boiler are water and and claimed.

of combustion.

UNrrnD STATES ATEN'I r ca.

HARRY S. 'PELL, OF AKRON, OHIO, ASSIGNOR TO THE STIRLING COMPANY,

- OF CHICAGO, ILLINOIS.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 549,012, dated October29, 1895. Application filed. June 9,1394. Serial is. 514,085. on mas.)

fact, the Water may in some casesbe passed To all whom it may concern:

Be it known that I, HARRY S. PELL, of Akron, Summit county, Ohio, haveinventedv a new and useful Improvement in Steam-Boilers, of which thefollowing is a specification.

The object of my invention is to improve the construction and operationof water-tube boilers of the type known as the Stirling boiler, and theinvention consists in the features and combinations hereinafterdescribed In the accompanying drawings, Figure l is a vertical sectiontaken on line 1 of Fig. 2; and Fig. 2, a vertical elevation, partly insection, taken on line 2 of Fig. 1.

In constructing my improved boiler I provide a fuel-chamber A, of anydesired form and size, and preferably covered with a firebrick arch a toaidin securing complete combustion of the gases and to direct the heatedgases and products of combustion into the furnace-chamberorboilerproper. Arranged steam drums B, O, and D,connected together bysteam-pipes b I), while the last two, the front and middle drums, arealso preferably connected together by Water-pipes c, which may be director circuitous, as desired. "Arranged in the lower part of the boiler isa mud-drum E, connected to the front and middle elevated drums by meansof banks of tubes e c, so as to afford water communication between them.Fire-brick partitions F and F may be arranged behind the front andmiddle banks of tubes, respectively, so as to deflect the heated gasesand products of combmion upward through the first bank of tubes and downthrough the second bank, which of course exposes a great portion oftheir length to the heated gases or products A rear lower mud-drum G isplaced in the lower part of the boiler, which mud-drum is provided witha bank of tubes g, afiording water communication with the feed-waterdrum B. This lower drum G is preferably provided with a pipe or pipes g,which connect it with the lower drum E, so that water communication maybe furnished through these two dru ms. This water communication may bedirect or circuitous, as desired. In

up through a separate drum while onits passage from one mud-drum to theother.

The rear bank of tubes and mud-drum G are located in the path of theheated gases and products of combustion as they pass out through theopening orchimney H' to the smoke-stack. I provide the rear wall of thefurnace with a deflecting or bafiie plate I,

which more surely compels the heated gases or products of combustion tokeep in contact with the rear bank of tubes before they pass out throughthe smoke-stack.

In operation, the supply of water enters the upper feed-drum B throughpipe I), where it may be passed over a cup-shaped disk, so as to fallgently against the surface of the water or sides of the drum, afterwhich it passes down through the rear bank of tubes into the lowermud-drum G. WVhile passing down through the rear upper mud-drum and rearbank of tubes the water is warmed or heated to such an extent that whenit enters the lower mud-drum G a portion of its sediment is precipitatedor settles therein. The water then passes on through the pipe or pipes 9into the mud-drum E, where it .takes' the course indicated by thearrows, flowing upward through the front bank of tubesinto the frontwater and steam drum, then through the connecting-pipes into the middlewater and steam drum, and down through the middle bank of tubes into thelower mud-drum E,

and so on in circuit. This circulation being old, however, it will beunderstood that I do not intend to limit myself to it; or to aconstruction in which it is produced or secured.

The lower mud-drums are each provided with blow-off cocks '5, throughwhich mud or go and then passing it down through the rear bank of tubesinto the lower mud-drum G in such manner that it is partially heated bythe escaping gases and products of com bustion, this resulting in thedeposition of a large amount of sediment before the water enters theother drums and tubes and goes into general circulation, and for thefeeding of this water, from which a large amount of sediment has beenalready removed, into a second lower mud-drum, Where it comes in contactwith the heated currents of water and is raised to a higher temperaturebefore entering the front bank of tubes, so that nearly all theremaining sediment is deposited in this second mud-drum before the waterpasses into the hottest part of the boiler. In this Way the formation ofscale in the hottest part of the boiler is prevented.

As the essential feature of my invention consists in providing for theintroduction of feed-water through an upper drum in the rear part of theboiler and in passing the water through more than one mud-drum in thelower part of the boiler, it will of course be understood that I do notintend to limit myself to minor features or details of constrnction orto the use of parts not mentioned in the claims. On the contrary, Icontemplate making formal changes and adding or omitting parts or usingequivalents, as circumstances may suggest or render expedient.

I claim-- 1. In a water-tube boiler, the combination of elevated steamand water drums, at lower mud drum, tubes connecting the lower mud drumwith the elevated steam and water drums, a rear elevated feed drum, arear lower mud drum, tubes connecting the feed drum with the rear lowermud drum, and means for introducing water into theelevated feed drum andpassing it to the forward part of the boiler, substantially asdescribed.

2. In a water-tube boiler, the combination of a rear elevated feed drum,a rear lower mud drum,-tubes connecting the rear lower mud drum with theelevated feed drum, a front lower mud drum, a pipe or pipes connectingthe rear and front lower mud drums, elevated steam and water drumshaving steam and water communication with each other, and tubesconnecting the front lower mud drum with the elevated steam and waterdrums, substantially as described HARRY S. PELL.

\Vitnesses:

P. HANSEN, R. W. HAINER.

